<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="vue.js" type="text/javascript"></script>
</head>
<body>
 <div id="box">
    {{msg}}
 </div>
<script>
    window.onload = function(){
        var c = new Vue({
            el:"#box",
            data:{
                msg:"123"
            }

        });
    }
</script>
</body>
</html>